1966155403 has 2 divisors, whose sum is σ = 1966155404. Its totient is φ = 1966155402.

The previous prime is 1966155379. The next prime is 1966155413. The reversal of 1966155403 is 3045516691.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1966155403 - 2¹⁷ = 1966024331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1966155413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983077701 + 983077702.

It is an arithmetic number, because the mean of its divisors is an integer number (983077702).

Almost surely, 2^1966155403 is an apocalyptic number.

1966155403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966155403 is an equidigital number, since it uses as much as digits as its factorization.

1966155403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 1966155403 is about 44341.3509379225. The cubic root of 1966155403 is about 1252.7736602018.

The spelling of 1966155403 in words is "one billion, nine hundred sixty-six million, one hundred fifty-five thousand, four hundred three".